Method, related device and system for correcting channels among far-end radio frequency units

An embodiment of the invention discloses a method, a related device and a system for correcting channels among far-end radio frequency units. The method for correcting the channels among the far-end radio frequency units comprises the steps of respectively transmitting correcting signals on M transmitting channels of N far-end radio frequency units, wherein working frequency points of the M transmitting channels are identical to working frequency points of correcting receiving channels; receiving the correcting signals which are transmitted by on the M transmitting channels and looped back by the correcting receiving channels; respectively calculating time delay compensation factors of the M transmitting channels according to the received correcting signals which are transmitted by on the M transmitting channels and looped back by the correcting receiving channels; respectively performing channel correction to the M transmitting channels according to the time delay compensation factors of the M transmitting channels so as to enable time delay of the M transmitting channels to be identical. By means of the technical scheme, the time delay consistency of the transmitting channels (and/or receiving channels) of multiple far-end radio frequency units can be achieved.